John cody



NITED STATES PATENT OFFICE.

l JOHN OODY, or New YORK, N. Y.

ROCKr-DRILL.

To all whom it may concern Be it known that I, JOHN CODY, of the city,county, and State of New York, have invented a new and ImprovedBoek-Drill 5 and I do hereby declare that the following is a'full,clear, and exact description of the same, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure lis a front view of my invention. Fig. 2 is a side view of thesame. Fig. 3 is a horizontal section of the same, taken in the line a"m, Fig. l.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists in an improved inode of operating the drill, ashereinafter fully shown and described, whereby the drill is operated ormade to act against the rock with an uniform blow throughout the entirelength of the hole to be drilled, the drill at the same time beingrotated and fed to its work by an automatic mechanism.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents a framing, which may be constructed in any proper mannertov support the working parts of the machine, and B is a driving-shaft,which is placed horizontally in the upper part of the framing A, and hasa crank, a, upon it, at about its center, a pinion, C, at one end, and adriving-wheel, D, at its opposite end, the wheel D being placed looselyon the shaft B, and connected with it when turned in one direction bymeans of a ratchet, b, and pawl c. The pinionO of the shaft B gears intoa pinion, E, on a shaft, F, which has a spiral cam, G, upon it, said camgearing into a worm-wheel, H, through which an arbor, I, passes, saidarbor having a longitudinal groove, d, made in it in which a feather orprojection, c, in the wheel H is fitted. (See Fig. 3.) By this means itwill be seen that the arbor I is allowed to rise and fall or movethrough the worm-wheel H, and the latter at the same time made to turnthe arbor I. The cam G has not a regular spiral curve. A portion of itis at right angles with its shaft F, so as to cause the arbor I to berotated intermittingly. In the lower end of the arbor I a drill, J, issecured, which may be of the usual form, and K is a cross-bar throughwhich the lower part of the arbor I passes, said crossbar being fittedbetween a collar, L, on the arbor and a shoulder, M, on the drill, andallowed to rise and fall freely in the framing.

The cross-barK is connected by two cords, N N, to drums O O on a shaft,P, on the upper part of the framing A, said shaft having a pinion, Q,upon it between the two drums, into which a pinion, It, gears, thelatter having a portion of its periphery smooth, as i lbar K there areattached two springs, X X,

which may be of india-rubber, or spiral wire springs may be used. Thesesprings have each a cord, Y, attached to them, which pass underneathpulleys Z Z in the lower part of the framing, and extend up and around ashaft, A', which has a pulley, B upon it with ratchets C attached, withwhich a pawl, A, engages, the pulley B having a cord, b', around it witha weight, B, attached.

The operation is as follows: The shaft B is rotated by any convenientpower, and a rocking motion is communicated to the shaft S through themedium of the crank a, cord U, and pulley T, and this rocking motion iscommunicated to the shaft D through the medium of the pinions B. Q, andthe drill J will consequently be operated-that is to sa-y, raised andlowered. The drill acts upon the rock in its descent, but its owngravity is not exclusively depended upon for penetration and force, asthe springs X X operate in addition to that. The drill feeds itself toits work in consequence of the teeth of the pinion Q being allowed toslip past the teeth of the pinion R, just above the smooth surface fthereof, and as the drill descends, the springs are kept at the properdegree of tension by means of the cords V V, shaft A', cord b', pulleyG', and weight B. Thus by this simple arrangement, a very efficientrock-drill is attained, one involving but little friction in itsoperation and capable of being operated with but a moderate expenditureof power.

Having thus described myinvention, whzitl 2. The springs X X, attachedto the bor K, and connected by the cords Y to the shaft A', having thepulley C upon it provided with the cord and Weight b B, substantially asand for the purpose specified.

JOHN CODY.

Witnesses:

JAMES P. HALL, M. M. LIVINGSTON.

